Body Systems

2. ______________ System. A system that the body needs to fight pathogens.
4. What makes up the skeletal system.
5. An organ that makes proteins and helps detoxify the body. Part of the excretory system.
7. Produces essential hormones for the body. Part of the excretory system.
8. A hormone that regulates the female reproductive system.
12. Molecules in food that an organism needs survive and grow.
13. A hormone that regulates the male reproductive system.
16. The essential part of the nervous system that regulates most of the body.
17. A part of the reproductive system that is usually found only in males.

1. The part of the circulatory system that pumps blood throughout the body.
3. A body system that is attached to the skeletal system and helps move the skeleton.
6. Attached to the stomach. Extracts energy and food and helps carry excrement out of the body.
9. A part of the reproductive system that is usually found only in females.
10. Forces air in and out of our body. Part of the respiratory system.
11. A system that is made of sensory organs and that our body uses to understand its environment.
14. An organ in the excretory system that helps break down food into smaller pieces and particles.
15. A protein that the body uses to help in chemical reactions. Used in the digestive system.